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HBase, mail # dev - Issues with delete markers


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Varun Sharma 2013-06-30, 19:03
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Varun Sharma 2013-06-30, 19:35
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Re: Issues with delete markers
Varun Sharma 2013-06-30, 20:03
For user scans, i feel we should be passing delete markers through as well.
On Sun, Jun 30, 2013 at 12:35 PM, Varun Sharma <[EMAIL PROTECTED]> wrote:

> I tried this a little bit and it seems that filters are not called on
> delete markers. For raw scans returning delete markers, does it make sense
> to do that ?
>
> Varun
>
>
> On Sun, Jun 30, 2013 at 12:03 PM, Varun Sharma <[EMAIL PROTECTED]>wrote:
>
>> Hi,
>>
>> We are having an issue with the way HBase does handling of deletes. We
>> are looking to retrieve 300 columns in a row but the row has tens of
>> thousands of delete markers in it before we span the 300 columns something
>> like this
>>
>>
>> row  DeleteCol1 Col1  DeleteCol2 Col2 ................... DeleteCol3 Col3
>>
>> And so on. Therefore, the issue here, being that to retrieve these 300
>> columns, we need to go through tens of thousands of deletes - sometimes we
>> get a spurt of these queries and that DDoSes a region server. We are okay
>> with saying, only return first 300 columns and stop once you encounter, say
>> 5K column delete markers or something.
>>
>> I wonder if such a construct is provided by HBase or do we need to build
>> something on top of the RAW scan and handle the delete masking there.
>>
>> Thanks
>> Varun
>>
>>
>>
>
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Varun Sharma 2013-06-30, 20:56
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Jesse Yates 2013-06-30, 23:00